Appendix Using the 32-Bit Pen Application Programming Interface
This appendix describes the 32-bit pen services provided by the PENWIN32.DLL
and PKPD32.DLL libraries. With some exceptions, these dynamic-link libraries
(DLLs) offer Win32™-based applications the same pen-based support as the 16-bit libraries
PENWIN.DLL and PKPD.DLL without requiring the intermediate steps of thunk conversions.
The services not supported by the 32-bit Pen Application Programming Interface
(API) consist mainly of outdated functions no longer required in version 2.0.
These outdated functions are supported in the 16-bit Pen API only to maintain
backward compatibility with version 1.0. They will not be supported in future
To enable 32-bit pen services, an application must be created in a 32-bit
that is, the compiler, linker, libraries, and header files must be of 32-bit
type. Before including pertinent header files, the application must define the
constant WIN32 as shown here:
A 32-bit application links to the pen system libraries in the same way it
links to any other Windows library, with either of the following methods:
- Link to the import library PKPD32.LIB (not recommended for PENWIN32.LIB) , or
- Explicitly load PENWIN32.DLL and PKPD32.DLL with the LoadLibrary function. After loading the libraries, the application must call GetProcAddress to obtain the address of each Pen API function it intends to use. Before
termin-ating, the application should call FreeLibrary to unload the libraries from memory.
The first method should normally be used to link functions in PKPD32.LIB. This
method can be used for functions in PENWIN32.LIB if it is known for certain
that the application will always be run on systems that have pen services
installed, in which case the application should test for the existence of pen services
at startup and exit if not found.
The second method should be used for PENWIN32.DLL functions when it is
anticipated that the application may be run on systems where pen services are not
installed. The reason for not linking PENWIN32.LIB is to prevent the application
from loading PENWIN32.DLL on a system that has not loaded pen services at
startup. This could happen, for example, on a computer that has PENWIN32.DLL on the
path but has not installed pen services. Loading PENWIN32.DLL dynamic-ally does
not sufficiently start pen services and errors are likely to occur.
In a 32-bit application, the call
GetSystemMetrics( SM_PENWINDOWS );
returns the handle of PENWIN32.DLL. This DLL makes available some of the same
resources (such as cursors) provided by the 16-bit PENWIN.DLL library.
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